Đun nóng 4,05 gam este X <span class="MathJax_Preview" style="color: inherit;"><span class="MJXp-math" id="MJXp-Span-1"><span class="MJXp-mstyle" id="MJXp-Span-2"><span class="MJXp-mo" id="MJXp-Span-3" style="margin-left: 0em; margin-right: 0em;">(</span><span class="MJXp-msubsup" id="MJXp-Span-4"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-5" style="margin-right: 0.05em;">C</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-6" style="vertical-align: -0.4em;"><span class="MJXp-mn" id="MJXp-Span-7">10</span></span></span><span class="MJXp-msubsup" id="MJXp-Span-8"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-9" style="margin-right: 0.05em;">H</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-10" style="vertical-align: -0.4em;"><span class="MJXp-mn" id="MJXp-Span-11">10</span></span></span><span class="MJXp-msubsup" id="MJXp-Span-12"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-13" style="margin-right: 0.05em;">O</span><span class="MJXp-mn MJXp-script" id="MJXp-Span-14" style="vertical-align: -0.4em;">2</span></span><span class="MJXp-mo" id="MJXp-Span-15" style="margin-left: 0em; margin-right: 0em;">)</span></span></span></span><span id="MathJax-Element-1-Frame" class="mjx-chtml MathJax_CHTML MJXc-processed" tabindex="0" style="font-size: 127%;"><span id="MJXc-Node-1" class="mjx-math"><span id="MJXc-Node-2" class="mjx-mrow"><span id="MJXc-Node-3" class="mjx-mstyle"><span id="MJXc-Node-4" class="mjx-mrow" style="font-size: 144%;"><span id="MJXc-Node-5" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.445em; padding-bottom: 0.593em;">(</span></span><span id="MJXc-Node-6" class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.045em;"><span id="MJXc-Node-7" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.495em; padding-bottom: 0.298em; padding-right: 0.045em;">C</span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span id="MJXc-Node-8" class="mjx-texatom" style=""><span id="MJXc-Node-9" class="mjx-mrow"><span id="MJXc-Node-10" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">10</span></span></span></span></span></span><span id="MJXc-Node-11" class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.057em;"><span id="MJXc-Node-12" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.445em; padding-bottom: 0.298em; padding-right: 0.057em;">H</span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span id="MJXc-Node-13" class="mjx-texatom" style=""><span id="MJXc-Node-14" class="mjx-mrow"><span id="MJXc-Node-15" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">10</span></span></span></span></span></span><span id="MJXc-Node-16" class="mjx-msubsup"><span class="mjx-base"><span id="MJXc-Node-17" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.495em; padding-bottom: 0.298em;">O</span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span id="MJXc-Node-18" class="mjx-mn" style=""><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">2</span></span></span></span><span id="MJXc-Node-19" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.445em; padding-bottom: 0.593em;">)</span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large (C_{10}H_{10}O_2)</script> cần dùng 35 gam du

Đun nóng 4,05 gam este X (C10H10O2)(C10H10O2) cần dùng 35 gam du

4.2/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Câu hỏi:

Đun nóng 4,05 gam este X (C10H10O2)(C10H10O2) cần dùng 35 gam dung dịch KOHKOH 8%, cô cạn dung dịch sau phản ứng, thu được m gam muối. Giá trị m là:

Đáp án án đúng là: B

Lời giải chi tiết:

Chọn B

nX=0,025nX=0,025 mol; nKOH=0,05nKOH=0,05 mol

nX:nKOH=1:2nX:nKOH=1:2 X là este của phenol

- X tác dụng với KOHKOH thì: 

RCOOC6H4R0,025mol+2KOH0,05molRCOOK+KOC6H4R+H2O0,025mol

BTKLmmuối =mX+56nKOH18nH2O=6,4(g)